updated for version 7.4.205
Problem:    ":mksession" writes command to move to second argument while it
	    does not exist.  When it does exist the order might be wrong.
Solution:   Use ":argadd" for each argument instead of using ":args" with a
	    list of names. (Nobuhiro Takasaki)
Added tag v7-4-205 for changeset 0ace3a24c2a0